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Gentoo's Bugzilla – Attachment 103325 Details for
Bug 156947
app-crypt/gnupg: exploitable invalid memory references [CVE-2006-6235]
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[patch]
patch against 1.4.x branch from werner koch
filter-context-14-small.diff (text/plain), 6.02 KB, created by
Tavis Ormandy (RETIRED)
on 2006-12-04 07:07:58 UTC
(
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Description:
patch against 1.4.x branch from werner koch
Filename:
MIME Type:
Creator:
Tavis Ormandy (RETIRED)
Created:
2006-12-04 07:07:58 UTC
Size:
6.02 KB
patch
obsolete
>This is a patch against GnuPG 1.4.5. Change the directory to g10/ and >apply this patch. > >2006-12-02 Werner Koch <wk@g10code.com> > > * encr-data.c: Allocate DFX context on the heap and not on the > stack. Changes at several places. Fixes CVE-2006-6235. > > > >--- encr-data.c.orig 2006-05-16 14:34:26.000000000 +0200 >+++ encr-data.c 2006-12-04 11:58:53.000000000 +0100 >@@ -44,7 +44,27 @@ typedef struct { > char defer[20]; > int defer_filled; > int eof_seen; >-} decode_filter_ctx_t; >+ int refcount; >+} *decode_filter_ctx_t; >+ >+ >+/* Helper to release the decode context. */ >+static void >+release_dfx_context (decode_filter_ctx_t dfx) >+{ >+ if (!dfx) >+ return; >+ >+ assert (dfx->refcount); >+ if ( !--dfx->refcount ) >+ { >+ cipher_close (dfx->cipher_hd); >+ dfx->cipher_hd = NULL; >+ md_close (dfx->mdc_hash); >+ dfx->mdc_hash = NULL; >+ xfree (dfx); >+ } >+} > > > /**************** >@@ -60,7 +80,10 @@ decrypt_data( void *procctx, PKT_encrypt > unsigned blocksize; > unsigned nprefix; > >- memset( &dfx, 0, sizeof dfx ); >+ >+ dfx = xcalloc (1, sizeof *dfx); >+ dfx->refcount = 1; >+ > if( opt.verbose && !dek->algo_info_printed ) { > const char *s = cipher_algo_to_string( dek->algo ); > if( s ) >@@ -79,15 +102,15 @@ decrypt_data( void *procctx, PKT_encrypt > BUG(); > > if( ed->mdc_method ) { >- dfx.mdc_hash = md_open( ed->mdc_method, 0 ); >+ dfx->mdc_hash = md_open ( ed->mdc_method, 0 ); > if ( DBG_HASHING ) >- md_start_debug(dfx.mdc_hash, "checkmdc"); >+ md_start_debug (dfx->mdc_hash, "checkmdc"); > } >- dfx.cipher_hd = cipher_open( dek->algo, >- ed->mdc_method? CIPHER_MODE_CFB >- : CIPHER_MODE_AUTO_CFB, 1 ); >+ dfx->cipher_hd = cipher_open ( dek->algo, >+ ed->mdc_method? CIPHER_MODE_CFB >+ : CIPHER_MODE_AUTO_CFB, 1 ); > /* log_hexdump( "thekey", dek->key, dek->keylen );*/ >- rc = cipher_setkey( dfx.cipher_hd, dek->key, dek->keylen ); >+ rc = cipher_setkey ( dfx->cipher_hd, dek->key, dek->keylen ); > if( rc == G10ERR_WEAK_KEY ) > { > log_info(_("WARNING: message was encrypted with" >@@ -105,7 +128,7 @@ decrypt_data( void *procctx, PKT_encrypt > goto leave; > } > >- cipher_setiv( dfx.cipher_hd, NULL, 0 ); >+ cipher_setiv ( dfx->cipher_hd, NULL, 0 ); > > if( ed->len ) { > for(i=0; i < (nprefix+2) && ed->len; i++, ed->len-- ) { >@@ -122,8 +145,8 @@ decrypt_data( void *procctx, PKT_encrypt > else > temp[i] = c; > } >- cipher_decrypt( dfx.cipher_hd, temp, temp, nprefix+2); >- cipher_sync( dfx.cipher_hd ); >+ cipher_decrypt ( dfx->cipher_hd, temp, temp, nprefix+2); >+ cipher_sync ( dfx->cipher_hd ); > p = temp; > /* log_hexdump( "prefix", temp, nprefix+2 ); */ > if(dek->symmetric >@@ -133,34 +156,34 @@ decrypt_data( void *procctx, PKT_encrypt > goto leave; > } > >- if( dfx.mdc_hash ) >- md_write( dfx.mdc_hash, temp, nprefix+2 ); >+ if ( dfx->mdc_hash ) >+ md_write ( dfx->mdc_hash, temp, nprefix+2 ); > >- if( ed->mdc_method ) >- iobuf_push_filter( ed->buf, mdc_decode_filter, &dfx ); >+ dfx->refcount++; >+ if ( ed->mdc_method ) >+ iobuf_push_filter( ed->buf, mdc_decode_filter, dfx ); > else >- iobuf_push_filter( ed->buf, decode_filter, &dfx ); >+ iobuf_push_filter( ed->buf, decode_filter, dfx ); > > proc_packets( procctx, ed->buf ); > ed->buf = NULL; >- if( ed->mdc_method && dfx.eof_seen == 2 ) >+ if( ed->mdc_method && dfx->eof_seen == 2 ) > rc = G10ERR_INVALID_PACKET; > else if( ed->mdc_method ) { /* check the mdc */ > int datalen = md_digest_length( ed->mdc_method ); > >- cipher_decrypt( dfx.cipher_hd, dfx.defer, dfx.defer, 20); >- md_final( dfx.mdc_hash ); >+ cipher_decrypt ( dfx->cipher_hd, dfx->defer, dfx->defer, 20); >+ md_final ( dfx->mdc_hash ); > if( datalen != 20 >- || memcmp(md_read( dfx.mdc_hash, 0 ), dfx.defer, datalen) ) >+ || memcmp(md_read( dfx->mdc_hash, 0 ), dfx->defer, datalen) ) > rc = G10ERR_BAD_SIGN; >- /*log_hexdump("MDC calculated:", md_read( dfx.mdc_hash, 0), datalen);*/ >- /*log_hexdump("MDC message :", dfx.defer, 20);*/ >+ /*log_hexdump("MDC calculated:",md_read( dfx->mdc_hash, 0), datalen);*/ >+ /*log_hexdump("MDC message :", dfx->defer, 20);*/ > } > > > leave: >- cipher_close(dfx.cipher_hd); >- md_close( dfx.mdc_hash ); >+ release_dfx_context (dfx); > return rc; > } > >@@ -171,7 +194,7 @@ static int > mdc_decode_filter( void *opaque, int control, IOBUF a, > byte *buf, size_t *ret_len) > { >- decode_filter_ctx_t *dfx = opaque; >+ decode_filter_ctx_t dfx = opaque; > size_t n, size = *ret_len; > int rc = 0; > int c; >@@ -226,8 +249,10 @@ mdc_decode_filter( void *opaque, int con > } > > if( n ) { >- cipher_decrypt( dfx->cipher_hd, buf, buf, n); >- md_write( dfx->mdc_hash, buf, n ); >+ if (dfx->cipher_hd) >+ cipher_decrypt( dfx->cipher_hd, buf, buf, n); >+ if (dfx->mdc_hash) >+ md_write( dfx->mdc_hash, buf, n ); > } > else { > assert( dfx->eof_seen ); >@@ -235,6 +260,9 @@ mdc_decode_filter( void *opaque, int con > } > *ret_len = n; > } >+ else if ( control == IOBUFCTRL_FREE ) { >+ release_dfx_context (dfx); >+ } > else if( control == IOBUFCTRL_DESC ) { > *(char**)buf = "mdc_decode_filter"; > } >@@ -244,7 +272,7 @@ mdc_decode_filter( void *opaque, int con > static int > decode_filter( void *opaque, int control, IOBUF a, byte *buf, size_t *ret_len) > { >- decode_filter_ctx_t *fc = opaque; >+ decode_filter_ctx_t fc = opaque; > size_t n, size = *ret_len; > int rc = 0; > >@@ -252,12 +280,17 @@ decode_filter( void *opaque, int control > assert(a); > n = iobuf_read( a, buf, size ); > if( n == -1 ) n = 0; >- if( n ) >- cipher_decrypt( fc->cipher_hd, buf, buf, n); >+ if( n ) { >+ if (fc->cipher_hd) >+ cipher_decrypt( fc->cipher_hd, buf, buf, n); >+ } > else > rc = -1; /* eof */ > *ret_len = n; > } >+ else if ( control == IOBUFCTRL_FREE ) { >+ release_dfx_context (fc); >+ } > else if( control == IOBUFCTRL_DESC ) { > *(char**)buf = "decode_filter"; > }
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bug 156947
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